The Ds\Deque::isEmpty() function is an inbuilt function in PHP which is used to check the Deque is empty or not.
Syntax:
public Ds\Deque::isEmpty( void ) : bool
Parameters: This function does not accept any parameter.
Return Value: This function returns true if the Deque is empty, else return false.
Below programs illustrate the Ds\Deque::isEmpty() function in PHP:
Program 1:
<?php // Declare a deque $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);
echo ( "Original Deque\n" );
// Display the Deque elements print_r( $deck );
// Use isEmpty() function to check // the deque is empty or not var_dump( $deck ->isEmpty());
?> |
Output:
Original Deque Ds\Deque Object ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) bool(false)
Program 2:
<?php // Declare a deque $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);
echo ( "Original Deque\n" );
// Display the Deque elements print_r( $deck );
// Clearing the Deque $deck ->clear();
// Use isEmpty() function to check // the deque is empty or not var_dump( $deck ->isEmpty());
?> |
Output:
Original Deque Ds\Deque Object ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) bool(true)
Reference: http://php.net/manual/en/ds-deque.isempty.php